MEGA SQUIRT tec Q

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exup
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Post Tue Feb 27, 2007 8:49 pm

Think this may be an ANT q, but trying not to flood him with questions


Can M/S be built / set up to run 12 injectors ? ie 12 injector out puts ?

, ie two banks of 6 , but each bank running off different base maps at the same time ,?, and could the injectors be of differant ohms value using fuel setting s?

if thats possible can the first set of injectors then be switched to a 3rd map whilst still running the second one 8O
Last edited by exup on Thu Mar 01, 2007 7:09 am, edited 1 time in total.
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Post Tue Feb 27, 2007 10:54 pm

Why would you want to is the question which springs to my drunken mind.

OK you can use 12 small injectors, but having different maps for each bank sounds like it would be a bit of a complex solution to a simple problem, and switching between 12 and 6 injectors either means having injectors that are too large if you can make full use of 6, or too small if you need to make full use of 12.

Also, if one injector fails for whatever reason with a twin injector setup, faulty wiring or whatever, you melt a piston, guaranteed. If an injector fails with a single/cyl setup, you get some rough running but nothing diasterous.
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jkarran
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Post Wed Feb 28, 2007 10:25 am

Different maps for inner and outer injectors (I'm guessing that's what you plan) can apparently yield some decent power gains especially with nice long runners. Check on the MS forums, instructions and FAQ, it's all there but it's a pain in the ass to trawl through.

I was thinking of running twin injectors on my SC conversion because it's cheap and will be simpler to start mapping (basically adding fuel to a running motor). The melted piston thing does put me off though so I think I'll be going for higher pressure fuel rail and/or new injectors :? $$$

Why would you want to swap maps? That bit I don't get. Dry nitros?

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exup
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Post Wed Feb 28, 2007 12:33 pm

Yep spent too many hrs last night looking on formums
but u right

Yep , i am planning on M/S if it can
1 replace motronic ie run m20 std 6 injectors (no problems here )
2 second bank of 6 to run lpg injectors , hence swopp to map no 2 once temp say 70 deg reached ( automatically or of a toggle sw) if poss

3 3rd mapp swops from map 1 to controll of petrol injectors for DRY NOS kit once nos system armed and is trigged off tps going full throttle but , whilsh still running map 2 ie lpg injectors :mad: :mad: :mad:
been talking to ant to see if its possible ,
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Ant
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Post Wed Feb 28, 2007 12:57 pm

1 and 2 can be done no worries with table switching and a changeover relay or similar Frank, you'd need to set the relay so the inj grounds are swopped lpg/petrol and the fuel pump is switched out @ the same time.

3 is an issue as there are not enough injector drivers to run both sets @ once, I'm sure that we can use one of the 5 spare logic level output to drive the desired outputs with another FET or similar.
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jkarran
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Post Wed Feb 28, 2007 1:17 pm

Cool project.

Would an electric heater for the lpg lines not be a simpler solution to the cold start problems?

jk
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Post Wed Feb 28, 2007 1:21 pm

thinking about it, with the dry nos switched in you can up the PWM on the injectors anyway, will take some tweaking to get right but would be the simple easy soloution .....

trust you Frank, someone wants it all , and then some :lol:
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exup
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Post Wed Feb 28, 2007 6:40 pm

Ant wrote:thinking about it, with the dry nos switched in you can up the PWM on the injectors anyway, will take some tweaking to get right but would be the simple easy soloution .....

trust you Frank, someone wants it all , and then some :lol:

Ant i like the ideal of upping the pulse width , but concerned of maxing out them out / running too lean on NOS ?
are talking of upping pwr on the LPG iinjectors or the petrol ones ?

i assumed it would be the "running set (in my mind LPG ones ), but if that was the petrol one s , i woulds have to up rate them to flow enought to feed n/a or turbo bhp + 100 to 125 nos shot , which may effect the slow speed running atomisation / ie bore wash ??
ideally my plan was to reuse the petrol ones which are idle whilst on LPG , but am open to all suggestions , ,
i posted this question on M/S BOARD , last night and , changing the code was offered as a poss solution (is that differcult ?)
, or would it be poss to have a 1 1/2 m/s ie something with twin fuel driver & map , ie giving 4 Maps ,??? :roll:
DRY NOS system s are so much better/ more reliable than wet one s , ,, i have another ideal on lpg control, use a mult point sytem , this uses 2 or 4 stepper motors to control the lpg feed into a common manifold with take offs to each runner , ive got a spare system prehaps we coulds set up a test /to see if its a poss ?
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Post Wed Feb 28, 2007 9:53 pm

jkarran wrote:Cool project.

Would an electric heater for the lpg lines not be a simpler solution to the cold start problems?

jk
thanks 4 the idear
Trace heating the line would be too inefficient and draw too many amps etc ,
What normally happens is you take a tapping off the block ( the rear tapping before it goes into heater matrix ideally ) and send this hot water into a VAPOURIZER, which converts liquid gas into a gases state which can be send onto an injector then cylinder
#
A really efficient thermodynamic solution would be to send liquid lpg to the injector , as this would reduce temps in cylinder and allow HIGHER Vol % , BUT INJECTOR SEAL PROBLEMS would prevent this at present , i fear :cry:
But keep the idears coming :wink:
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exup
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Post Wed Feb 28, 2007 10:44 pm

One more question
by running M/S do you still keep the MAF ?
on n/a and on turbo applications ?